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Cropping is the removal of unwanted outer areas from a photographic or illustrated image. The process usually consists of the removal of some of the peripheral areas of an image to remove extraneous visual data from the picture, improve its framing, change the aspect ratio, or accentuate or isolate the subject matter from its background.
See also Template:Easy CSS image crop, which simplifies the interface for this template a bit. {{CSS image crop}} creates a crop of an image inline for previewing the look and feel of a page, or for linking to full images when a slight crop is preferred in an article, but the full image is more encyclopaedic in general. Where only a small ...
For the crop parameters, note that since we're going for a desired width, the size of the image being cropped from will vary depending on what crop_left and crop_right are set to. As such, these should be set before playing with crop_top and crop_bottom. All default to 0, which means nothing is cropped from that side.
This is much, much harder with {{tl|CSS image crop: You have to calculate a scaling ratio and apply it to every parameter. Admittedly, cropping a tiny bit out of a large image with any sort of CSS image crop is very inefficient: It still has to load a thumbnail big enough to crop that tiny bit from.
} creates a crop of a graphics object (like a location map) which cannot be cropped with {{CSS image crop}}. The syntax and code are derivative of {CSS image ...
Scale the image to be no greater than the given width or height, keeping its aspect ratio. Scaling up (i.e. stretching the image to a greater size) is disabled when the image is framed. Link Link the image to a different resource, or to nothing. Alt Specify the alt text for the image. This is intended for visually impaired readers.